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G. Contractor shall allow the Engineer to install hydrology meter during well development. H. Contractor shall develop well using mechanical surging or over pumping or a combination thereof per ASTM D 5521. Contractor shall purge the well until:. 1. Well water is clear to the unaided eye. 2. Sediment in the well casing is less than 0.1 foot thick. 3. Water removed during surging and purging shall be a minimum of three times the water volume in the well prior to the start of purging plus three times the volume of water added for purging and surging. 4. Contractor shall purge until: 5. Temperature is consistent within 0.2 deg F, 6. Specific conductivity is consistent within + 3 percent change in specific conductance. 7. pH varies less than 0.2 pH units 8. Turbidity varies not more than 10% 3.04 WELL DEVELOPMENT RECORDS A. Contractor shall submit to the Engineer in the writing the following well development data for each well development. Submittal shall be made within two business days of completing well development. Engineer may request any other data in the field. 1. Name of project, site, well identification number, date and time of development and name of person developing the well. 2. Method used for development, to include size, type and make of equipment, bailer, and/or pump used during development. 3. Depth to bottom of well pre and post development 4. Static water level before and after well development 5. Time spent developing the well by each method, to include typical pumping rate, if pump is used in development. 6. Minimum purge volume 7. Amount of water purged. Provide physical character of water removed, to 1 include changes during development in clarity, color, particulates, and odor. 8. Volume and source of water added to the well, if any. On-Call Driller RFB 6820 San Joaquin County Groundwater Monitoring Well Specifications 10 Public Works Dept Solid Waste Division